Refrigeration and Air Conditioning

Question: Oil separator in a refrigeration cycle is installed
[A].

before compressor

[B].

between compressor and condenser

[C].

between condenser and evaporator

[D].

between condenser and expansion valve

Answer: Option B

Explanation:

No answer description available for this question.

Question: During gas charging in an ammonia vapour compression system, the connection is made at the compressor outlet.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.

Question: The C.O.P. of an absorption type refrigerator is given by (where T1 = Temperature at which the working substance receives heat, T2 = Temperature of cooling water, and T3 = Evaporator temperature)
[A].

[B].

[C].

[D].

Answer: Option B

Explanation:

No answer description available for this question.

Question: A vapour absorption refrigerator uses __________ as a refrigerant.
[A].

water

[B].

ammonia

[C].

freon

[D].

aqua-ammonia

Answer: Option D

Explanation:

No answer description available for this question.

Question: In order to collect liquid refrigerant and to prevent it from going to a __________ , a device known as accumulator is used at the suction of compressor.
[A].

compressor

[B].

condenser

[C].

expansion valve

[D].

evaporator

Answer: Option A

Explanation:

No answer description available for this question.

Question: During sub-cooling, sensible heat from a liquid refrigerant is removed.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.
[A].

True

[B].

False

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
[A].

wet vapour region

[B].

superheated vapour region

[C].

sub-cooled liquid region

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: In a vapour compression system, the condition of refrigerant is dry saturated vapour
[A].

before entering the compressor

[B].

after leaving the compressor

[C].

before entering the condenser

[D].

after leaving the condenser

Answer: Option A

Explanation:

No answer description available for this question.

Question: In a vapour compression refrigeration system, a throttle valve is used in place of an expander because
[A].

it considerably reduces mass of the system

[B].

it improves the C.O.P., as the condenser is small

[C].

the positive work in isentropic expansion of liquid is very small

[D].

it leads to significant cost reduction

Answer: Option C

Explanation:

No answer description available for this question.